Lauren Hasselman could not create a Teams group on 2026-05-05. Diagnostic confirmed the block is at the Teams Admin policy layer (intentional, gated on HIPAA prerequisites in m365.md issues #12-#14), not an Entra/M365-Group permissions defect. New teams-rollout.md captures prerequisites, HIPAA config checklist, canary test plan (Lauren as primary canary), and exit criteria. Linked from m365.md issue #14.